Elasticity mapping of gastrocnemius fascia and myotendinous junction of the medial gastrocnemius during passive ankle and knee dorsiflexion

Background and purpose: Muscle strain is a common side-effect of exercise. In this context, many scholars have focused primarily on the biological characteristics of the muscle, generally overlooking the importance of myofascial elasticity. Therefore, the aims of the present study were: (1) to evaluate the intra- and inter-operator reliability of elasticity measurements in the myofascial and myotendinous junction (MTJ) using ultrasound shear wave elastography (USWE); (2) to establish the association between myofascial elasticity and passive joint angles. Methods: Twenty-one healthy and physically active adults participated in this study. The elasticity of the medial gastrocnemius muscle fascia (MGF), lateral gastrocnemius muscle fascia (LGF), and MTJ were quantified at different angles using USWE. Results: < 0.01). Conclusions: , which may guide future evaluation and rehabilitation strategies for muscle strain-related injuries.